farhop 5mW 650nm Focusable Red Line Laser Diode Module 3-5V with Clamshell Packaging (2 Pack)

I just received my 2 pack of lasers today. Both work well and appear visually to be the same brightness. I do not have a laser power meter to confirm the mw output. In all honestly if you are buying this you aren't after a high power laser to begin with, so I'm not sure the power matters other than saying "its bright, and no - you aren't setting things on fire with this. "Note: most laser failures are attributed to crappy power supplies. I suggest you make 100% sure your power supply can not exceed tree rated voltage under any conditions.So far so good, I am happy with the lasers. I will update this review of there are any issues.

Maybe I got lucky, but no QA issues with the lasers. Using one of these bad boys to upgrade a Walmart jigsaw with a guideline - they're bright and perfect for the job (bonus: you can rotate the line if you're ok with t being a little fuzzier).

The focus is quite wobbly, bit I was able to line the threads with masking tape (I didn't have any Teflon), to increase the diameter. No more wobble.

This too I build acupuncture devices, I use to energize parts of channels, as it displays a line of laser.

worked as described

work well for making a red line!

very bright and sharp focus.

I have ordered two sets of these and with both sets one of the two units was defective. Looking at reviews for sellers who sell similar units I see others have had the same experience. Lots of wasted time and effort. Before you start taking anything apart to install these, test the laser diodes to make sure they will operate for at least a minute or so. I gave the product two stars just because they would probably be pretty great if by the luck-of-the-draw you receive two good units.